forked from openkylin/kolourpaint
157 lines
4.4 KiB
C++
157 lines
4.4 KiB
C++
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/*
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Copyright (c) 2003-2007 Clarence Dang <dang@kde.org>
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef KP_COLOR_H
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#define KP_COLOR_H
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#include <QColor>
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class QDataStream;
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//
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// kpColor is an object-oriented abstraction of QRgb, for document image data.
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// In the future, other color models such as
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// 8-bit indexed will be supported. It also provides better error handling,
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// reporting (noisy qCCritical(kpLogImagelib)'s) and recovery compared to Qt. This abstraction
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// will allow us to eventually dump the Qt paint routines.
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//
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// In general, you should pass around kpColor objects instead of QRgb
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// and QColor. Only convert an opaque kpColor to a QColor (using toQColor())
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// if you need to draw something on-screen.
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//
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// Constructing a kpColor object from QColor is usually wrong since QColor's
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// come from on-screen pixels, which may lack the full color resolution of
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// kpColor, due to the limited color range on e.g. a 16-bit screen.
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//
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class kpColor
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{
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public:
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kpColor ();
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kpColor (int red, int green, int blue, bool isTransparent = false);
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kpColor (const QRgb &rgba);
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kpColor (const kpColor &rhs);
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friend QDataStream &operator<< (QDataStream &stream, const kpColor &color);
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friend QDataStream &operator>> (QDataStream &stream, kpColor &color);
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kpColor &operator= (const kpColor &rhs);
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bool operator== (const kpColor &rhs) const;
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bool operator!= (const kpColor &rhs) const;
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//
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// Constants
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//
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public:
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// "lhs.isSimilarTo (rhs, kpColor::Exact)" is exactly the same as calling
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// "lhs == rhs".
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static const int Exact;
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static const kpColor Invalid;
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static const kpColor Transparent;
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//
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// Primary Colors + B&W
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//
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static const kpColor Red, Green, Blue;
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static const kpColor Black, White;
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//
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// Full-brightness Colors
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//
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static const kpColor Yellow, Purple, Aqua;
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//
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// Mixed Colors
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//
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static const kpColor Gray, LightGray, Orange;
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//
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// Pastel Colors
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//
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static const kpColor Pink, LightGreen, LightBlue, Tan;
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//
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// Dark Colors
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//
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static const kpColor DarkRed;
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// (identical)
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static const kpColor DarkOrange, Brown;
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static const kpColor DarkYellow, DarkGreen, DarkAqua, DarkBlue,
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DarkPurple, DarkGray;
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public:
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static int processSimilarity (double colorSimilarity);
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// Usage: isSimilarTo (rhs, kpColor::processSimilarity (.1)) checks for
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// Color Similarity within 10%
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bool isSimilarTo (const kpColor &rhs, int processedSimilarity) const;
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bool isValid () const;
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int red () const;
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int green () const;
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int blue () const;
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int alpha () const;
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bool isTransparent () const;
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// Cast operators will most likely result in careless conversions so
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// use explicit functions instead:
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QRgb toQRgb () const;
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QColor toQColor () const;
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private:
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// Catch accidental call to "const QRgb &rgba" (unsigned int) ctor
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// by e.g. "kpColor(Qt::black)" (Qt::black is an enum element that can cast
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// to "unsigned int").
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kpColor (Qt::GlobalColor color);
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bool m_rgbaIsValid;
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QRgb m_rgba;
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mutable bool m_colorCacheIsValid;
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mutable QColor m_colorCache;
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};
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#endif // KP_COLOR_H
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